#include "xattr.h"
#include "disk-io.h"
-static struct xattr_handler *btrfs_xattr_handler_map[] = {
- [BTRFS_XATTR_INDEX_USER] = &btrfs_xattr_user_handler,
- [BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &btrfs_xattr_acl_access_handler,
- [BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &btrfs_xattr_acl_default_handler,
- [BTRFS_XATTR_INDEX_TRUSTED] = &btrfs_xattr_trusted_handler,
- [BTRFS_XATTR_INDEX_SECURITY] = &btrfs_xattr_security_handler,
- [BTRFS_XATTR_INDEX_SYSTEM] = &btrfs_xattr_system_handler,
-};
-
-struct xattr_handler *btrfs_xattr_handlers[] = {
- &btrfs_xattr_user_handler,
- &btrfs_xattr_acl_access_handler,
- &btrfs_xattr_acl_default_handler,
- &btrfs_xattr_trusted_handler,
- &btrfs_xattr_security_handler,
- &btrfs_xattr_system_handler,
- NULL,
-};
-
-/*
- * @param name - the xattr name
- * @return - the xattr_handler for the xattr, NULL if its not found
- *
- * use this with listxattr where we don't already know the type of xattr we
- * have
- */
-static struct xattr_handler *find_btrfs_xattr_handler(struct extent_buffer *l,
- unsigned long name_ptr,
- u16 name_len)
-{
- struct xattr_handler *handler = NULL;
- int i = 0;
-
- for (handler = btrfs_xattr_handlers[i]; handler != NULL; i++,
- handler = btrfs_xattr_handlers[i]) {
- u16 prefix_len = strlen(handler->prefix);
-
- if (name_len < prefix_len)
- continue;
-
- if (memcmp_extent_buffer(l, handler->prefix, name_ptr,
- prefix_len) == 0)
- break;
- }
-
- return handler;
-}
-
-/*
- * @param name_index - the index for the xattr handler
- * @return the xattr_handler if we found it, NULL otherwise
- *
- * use this if we know the type of the xattr already
- */
-static struct xattr_handler *btrfs_xattr_handler(int name_index)
-{
- struct xattr_handler *handler = NULL;
-
- if (name_index >= 0 &&
- name_index < ARRAY_SIZE(btrfs_xattr_handler_map))
- handler = btrfs_xattr_handler_map[name_index];
-
- return handler;
-}
-
-static inline char *get_name(const char *name, int name_index)
-{
- char *ret = NULL;
- struct xattr_handler *handler = btrfs_xattr_handler(name_index);
- int prefix_len;
-
- if (!handler)
- return ret;
-
- prefix_len = strlen(handler->prefix);
-
- ret = kmalloc(strlen(name) + prefix_len + 1, GFP_KERNEL);
- if (!ret)
- return ret;
- memcpy(ret, handler->prefix, prefix_len);
- memcpy(ret+prefix_len, name, strlen(name));
- ret[prefix_len + strlen(name)] = '\0';
-
- return ret;
-}
-
-size_t btrfs_xattr_generic_list(struct inode *inode, char *list,
- size_t list_size, const char *name,
- size_t name_len)
-{
- if (list && (name_len+1) <= list_size) {
- memcpy(list, name, name_len);
- list[name_len] = '\0';
- } else
- return -ERANGE;
-
- return name_len+1;
-}
-
-ssize_t btrfs_xattr_get(struct inode *inode, int name_index,
- const char *attr_name, void *buffer, size_t size)
+ssize_t __btrfs_getxattr(struct inode *inode, const char *name,
+ void *buffer, size_t size)
{
struct btrfs_dir_item *di;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_path *path;
struct extent_buffer *leaf;
- struct xattr_handler *handler = btrfs_xattr_handler(name_index);
int ret = 0;
unsigned long data_ptr;
- char *name;
-
- if (!handler)
- return -EOPNOTSUPP;
-
- /* just in case... */
- if (*attr_name == '\0')
- return -EINVAL;
-
- name = get_name(attr_name, name_index);
- if (!name)
- return -ENOMEM;
path = btrfs_alloc_path();
- if (!path) {
- kfree(name);
+ if (!path)
return -ENOMEM;
- }
- mutex_lock(&root->fs_info->fs_mutex);
/* lookup the xattr by name */
di = btrfs_lookup_xattr(NULL, root, path, inode->i_ino, name,
strlen(name), 0);
data_ptr = (unsigned long)((char *)(di + 1) +
btrfs_dir_name_len(leaf, di));
read_extent_buffer(leaf, buffer, data_ptr,
- btrfs_dir_name_len(leaf, di));
+ btrfs_dir_data_len(leaf, di));
ret = btrfs_dir_data_len(leaf, di);
out:
- mutex_unlock(&root->fs_info->fs_mutex);
- kfree(name);
btrfs_free_path(path);
return ret;
}
-int btrfs_xattr_set(struct inode *inode, int name_index,
- const char *attr_name, const void *value, size_t size,
- int flags)
+int __btrfs_setxattr(struct inode *inode, const char *name,
+ const void *value, size_t size, int flags)
{
struct btrfs_dir_item *di;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
struct btrfs_path *path;
- struct xattr_handler *handler = btrfs_xattr_handler(name_index);
- char *name;
int ret = 0, mod = 0;
- if (!handler)
- return -EOPNOTSUPP;
-
- /* just in case... */
- if (*attr_name == '\0')
- return -EINVAL;
-
- name = get_name(attr_name, name_index);
- if (!name)
- return -ENOMEM;
-
path = btrfs_alloc_path();
- if (!path) {
- kfree(name);
+ if (!path)
return -ENOMEM;
- }
- mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, inode);
mod = 1;
goto out;
}
- } else if (flags & XATTR_REPLACE) {
- /* we couldn't find the attr to replace, so error out */
- ret = -ENODATA;
- goto out;
+ } else {
+ btrfs_release_path(root, path);
+
+ if (flags & XATTR_REPLACE) {
+ /* we couldn't find the attr to replace */
+ ret = -ENODATA;
+ goto out;
+ }
}
/* ok we have to create a completely new xattr */
}
btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
- kfree(name);
btrfs_free_path(path);
-
return ret;
}
struct btrfs_item *item;
struct extent_buffer *leaf;
struct btrfs_dir_item *di;
- struct xattr_handler *handler;
int ret = 0, slot, advance;
- size_t total_size = 0, size_left = size, written;
+ size_t total_size = 0, size_left = size;
unsigned long name_ptr;
- char *name;
+ size_t name_len;
u32 nritems;
/*
key.offset = 0;
path = btrfs_alloc_path();
- path->reada = 2;
if (!path)
return -ENOMEM;
-
- mutex_lock(&root->fs_info->fs_mutex);
+ path->reada = 2;
/* search for our xattrs */
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
- total_size += btrfs_dir_name_len(leaf, di)+1;
+ name_len = btrfs_dir_name_len(leaf, di);
+ total_size += name_len + 1;
/* we are just looking for how big our buffer needs to be */
if (!size)
continue;
- /* find our handler for this xattr */
- name_ptr = (unsigned long)(di + 1);
- handler = find_btrfs_xattr_handler(leaf, name_ptr,
- btrfs_dir_name_len(leaf, di));
- if (!handler) {
- printk(KERN_ERR "btrfs: unsupported xattr found\n");
- continue;
- }
-
- name = kmalloc(btrfs_dir_name_len(leaf, di), GFP_KERNEL);
- read_extent_buffer(leaf, name, name_ptr,
- btrfs_dir_name_len(leaf, di));
-
- /* call the list function associated with this xattr */
- written = handler->list(inode, buffer, size_left, name,
- btrfs_dir_name_len(leaf, di));
- kfree(name);
-
- if (written < 0) {
+ if (!buffer || (name_len + 1) > size_left) {
ret = -ERANGE;
- break;
+ goto err;
}
- size_left -= written;
- buffer += written;
+ name_ptr = (unsigned long)(di + 1);
+ read_extent_buffer(leaf, buffer, name_ptr, name_len);
+ buffer[name_len] = '\0';
+
+ size_left -= name_len + 1;
+ buffer += name_len + 1;
}
ret = total_size;
err:
- mutex_unlock(&root->fs_info->fs_mutex);
btrfs_free_path(path);
return ret;
}
/*
- * delete all the xattrs associated with the inode. fs_mutex should be
- * held when we come into here
+ * List of handlers for synthetic system.* attributes. All real ondisk
+ * attributes are handled directly.
*/
-int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct inode *inode)
-{
- struct btrfs_path *path;
- struct btrfs_key key, found_key;
- struct btrfs_item *item;
- struct extent_buffer *leaf;
- int ret;
-
- path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
-
- key.objectid = inode->i_ino;
- btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY);
- key.offset = (u64)-1;
+struct xattr_handler *btrfs_xattr_handlers[] = {
+#ifdef CONFIG_FS_POSIX_ACL
+ &btrfs_xattr_acl_access_handler,
+ &btrfs_xattr_acl_default_handler,
+#endif
+ NULL,
+};
- while(1) {
- /* look for our next xattr */
- ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
- if (ret < 0)
- goto out;
- BUG_ON(ret == 0);
+/*
+ * Check if the attribute is in a supported namespace.
+ *
+ * This applied after the check for the synthetic attributes in the system
+ * namespace.
+ */
+static bool btrfs_is_valid_xattr(const char *name)
+{
+ return !strncmp(name, XATTR_SECURITY_PREFIX,
+ XATTR_SECURITY_PREFIX_LEN) ||
+ !strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) ||
+ !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
+ !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
+}
- if (path->slots[0] == 0)
- break;
+ssize_t btrfs_getxattr(struct dentry *dentry, const char *name,
+ void *buffer, size_t size)
+{
+ /*
+ * If this is a request for a synthetic attribute in the system.*
+ * namespace use the generic infrastructure to resolve a handler
+ * for it via sb->s_xattr.
+ */
+ if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+ return generic_getxattr(dentry, name, buffer, size);
- path->slots[0]--;
- leaf = path->nodes[0];
- item = btrfs_item_nr(leaf, path->slots[0]);
- btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ if (!btrfs_is_valid_xattr(name))
+ return -EOPNOTSUPP;
+ return __btrfs_getxattr(dentry->d_inode, name, buffer, size);
+}
- if (found_key.objectid != key.objectid)
- break;
- if (btrfs_key_type(&found_key) != BTRFS_XATTR_ITEM_KEY)
- break;
+int btrfs_setxattr(struct dentry *dentry, const char *name, const void *value,
+ size_t size, int flags)
+{
+ /*
+ * If this is a request for a synthetic attribute in the system.*
+ * namespace use the generic infrastructure to resolve a handler
+ * for it via sb->s_xattr.
+ */
+ if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+ return generic_setxattr(dentry, name, value, size, flags);
- ret = btrfs_del_item(trans, root, path);
- BUG_ON(ret);
- btrfs_release_path(root, path);
- }
- ret = 0;
-out:
- btrfs_free_path(path);
+ if (!btrfs_is_valid_xattr(name))
+ return -EOPNOTSUPP;
- return ret;
+ if (size == 0)
+ value = ""; /* empty EA, do not remove */
+ return __btrfs_setxattr(dentry->d_inode, name, value, size, flags);
}
-/*
- * Handler functions
- */
-#define BTRFS_XATTR_SETGET_FUNCS(name, index) \
-static int btrfs_xattr_##name##_get(struct inode *inode, \
- const char *name, void *value, \
- size_t size) \
-{ \
- return btrfs_xattr_get(inode, index, name, value, size); \
-} \
-static int btrfs_xattr_##name##_set(struct inode *inode, \
- const char *name, const void *value,\
- size_t size, int flags) \
-{ \
- return btrfs_xattr_set(inode, index, name, value, size, flags); \
-} \
-
-BTRFS_XATTR_SETGET_FUNCS(security, BTRFS_XATTR_INDEX_SECURITY);
-BTRFS_XATTR_SETGET_FUNCS(system, BTRFS_XATTR_INDEX_SYSTEM);
-BTRFS_XATTR_SETGET_FUNCS(user, BTRFS_XATTR_INDEX_USER);
-BTRFS_XATTR_SETGET_FUNCS(trusted, BTRFS_XATTR_INDEX_TRUSTED);
-
-struct xattr_handler btrfs_xattr_security_handler = {
- .prefix = XATTR_SECURITY_PREFIX,
- .list = btrfs_xattr_generic_list,
- .get = btrfs_xattr_security_get,
- .set = btrfs_xattr_security_set,
-};
-
-struct xattr_handler btrfs_xattr_system_handler = {
- .prefix = XATTR_SYSTEM_PREFIX,
- .list = btrfs_xattr_generic_list,
- .get = btrfs_xattr_system_get,
- .set = btrfs_xattr_system_set,
-};
-
-struct xattr_handler btrfs_xattr_user_handler = {
- .prefix = XATTR_USER_PREFIX,
- .list = btrfs_xattr_generic_list,
- .get = btrfs_xattr_user_get,
- .set = btrfs_xattr_user_set,
-};
+int btrfs_removexattr(struct dentry *dentry, const char *name)
+{
+ /*
+ * If this is a request for a synthetic attribute in the system.*
+ * namespace use the generic infrastructure to resolve a handler
+ * for it via sb->s_xattr.
+ */
+ if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+ return generic_removexattr(dentry, name);
-struct xattr_handler btrfs_xattr_trusted_handler = {
- .prefix = XATTR_USER_PREFIX,
- .list = btrfs_xattr_generic_list,
- .get = btrfs_xattr_trusted_get,
- .set = btrfs_xattr_trusted_set,
-};
+ if (!btrfs_is_valid_xattr(name))
+ return -EOPNOTSUPP;
+ return __btrfs_setxattr(dentry->d_inode, name, NULL, 0, XATTR_REPLACE);
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff